code: def testOctave(self):
      inputv = readVector(join(testdir, "octave_input.txt"))
      expected = readVector(join(testdir, "octave_output.txt"))
  
      output = AutoCorrelation()(inputv)
  
      self.assertEqual(len(expected) / 2, len(output))
  
      self.assertAlmostEqualVector(
          expected[: int(len(expected) / 2)], output, 1e-4
      )
  
file_path: essentia/test/src/unittests/stats/test_autocorrelation.py
imports: from essentia_test import *
label_desc: Use image node_id 3 for calling the TestAutoCorrelation obj's underlying member method code with example usage: obj.testOctave() without return types